Alexander tdrxbull



(No Model.) 1 A. TURNBULL.

STEAM TRAP.

No. 540,470. Patented June 4, 1895. v

QQLbnessem- Q 1wenZpr T r nonms PETERS c0. PHOTO-LITNO.. WASMINGYON u c MED ST ALEXANDER TURNBULL, OF BISHOPBRIDGE, SCOTLAND.-

STEAM-TRAP.

SPECIFICATION forming part of Letters Patent No. 540,470, dated June 4,1895. Application filed December 19, 1694- Serial No. 532,349. (No model.) Patented in England March 25, 1893, No. 6,366.

To all whom it may concern: I Be it known that I, ALEXANDER TURNBULL, engineer, a subject of the Queen of the United Kingdom of Great Britain and Ireland,residing at St. Mungo Works, Bishopbridge, in the county of Lanark, Scotland, have invented new and useful Improvements in Steam-Traps, (which have not been patented in any country except. Great Britain by Letters Patent dated to March 25,1893, No. 6,366;) and I do hereby declare that the following is a full, clear, and exact descriptionof the invention, which will enable others skilled in the art or manufacture to which it relates to make and use the I 5 same. v

My invention has for its object to provide a steam trap wherein the closing pressure on the discharge valve is regulatedor controlled by a spring the degree of tension or comzo pression of which may be varied to support more or less of the weight of a water vessel or floatpartially floated or buoyed up by the water of condensation within the casing.

In the accompanying drawings, Figure lis a vertical section of my improved steam-trap in which the regulating spring is under tension; and Fig. 2 is a similar view of another form of trap, showing in full lines the regulating-spring under compression and in dot 3o ted lines a modification as far as the position of the regulating-spring is concerned, the spring in the latter case being held in tension.

As shown at Fig. 1 the improved trap is composed of the usual casingA having an in- 3 5 let a for steam and water and an outlet a for the Water of condensation, the outlet orifice being fitted with a valve seat B over which is fitted a valve 0 attached by ascrew-threaded stem 0 toa float or vesselD filled with water 0 and serving by its weight to maintain'the valve normally closed upon its seat.

To the valve stem 0' is attached one end of a helical spring E whose other end is connected to a bridge or saddle piece F suspended on a screw-threaded spindle G passing through a nut or nuts G fitted in the closed cover A of the trap casing the spring being adapted to wholly or partially counterbalance the filled;

weight of the water vessel D. By turning the spindle G and thereby raising or lowering the bridge piece F the tension on the spring E may be varied so as toincrease or diminish the closing pressure on the valve due to the weight. of the can D and its contents. A plugged orifice H is provided in the cover A through which the can D is filled with water. 7

In the operation of the apparatus the water formed by condensation of steam entering the casing A by the inlet C6 falls into the can D and overflows the casing becoming partially When the water accumulates in suf ficient quantity to buoy up the can D, which will be dependent on the weight supported by the spring E, the valve 0 is lifted from its seat and the steam pressure forces out so much of the water from the casing through the outlet at as will permit of the weight of the can D overcoming the buoyancy of the water whereupon the can D descends and closes the valve.

In the form of my invention shown in full lines at Fig. 2 the can or vesselD is supported by a spring interposed between it and the bottom part of the casing and is under compression. The can D is of annular form and the water passes out of the casing by an annular passage between the can and the outlet pipe 0, which is carried up vertically and terminates in a valve seat formed under the valve 0 which has a screw-threaded stem 0 passed through an orifice tapped in the central part of the can. Adjustment of the closing pressure upon the valve 0 may in this example be effected by screwing or unscrewing the valve stem 0 to raise or lower the valve so that the spring E carries more or less of the weight of the can. With this formation of can and outlet a spring E in tension from which the can is suspended may be used as indicated by dotted lines, in lieu of the spring E under compression, or in conjunction with it, An adjustable stop I is provided in each case to limit the extent of upward movement of the can and consequent opening of the valve.

Having now described the invention, What I desire to claim and secure by Letters Patent is In a steam trap, the combination with its In witness whereof I have hereunto set my casing, of a vessel or float partially floated or hand and seal this 3d day of December, 1894. buoyed up by the collecting waterof condensation, a discharge valve attached to the float, ALEXMDER IUMBULT" 5 a spring from which the float is suspended, In presence of WALLACE FAIRWEATI-IER, Jno. ARMSTRONG, Jr.

and an adjustable hanger supporting the spring, substantially as set forth. 

